Acknowledgements

Figure 1:

http://www.google.com/imgres?imgurl=http://farm4.static.flickr.com/3333/3430046076_25f6f6df50_o.jpg&imgrefurl=http:

//www.flickr.com/services/feeds/geo/%3Fformat%3Dkml%26id%3D21613510%2540N00%2

6lang%3Den-us%26page%3D1&usg=__1v3PefBwpGMA2mxjQEFX7G2Z-VI=&h=2066&w=3255&sz=4232&hl=en&start=38&sig2=LjtORjJniD2Urs4FxkagHA&zoom=

1&tbnid=TWvTVY95VntGPM:&tbnh=138&tbnw=197&ei=Y_FOTfiUJ8KecerdyfsF&prev=/images

%3Fq%3DDuomo%2Bdi%2BMilano%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1278%2

6bih%3D590%26tbs%3Disch:11%2C966&um=1&itbs=1&iact=rc&dur=513&oei=rfBOTY20JMT

NrQfxuvnaBg&esq=32&page=3&ndsp=18&ved=1t:429,r:6,s:38&tx=4&ty=96&biw=1278&bih=590

Figure 2:

http://www.google.com/imgres?imgurl=http://www.the-artfile.com/gallery/history/roman/colosseum.jpg&imgrefurl=http://www.the-artfile.com/ArtFile/history/roman/colosseum.shtml&usg=__T3LsB89-kryPStjIOJ61PDaRKhc=&h=331&w=493&sz=78&hl=en&start=0&sig2=fHY9rN-zJ1la1nGb5s9-BA&zoom=1&tbnid=1WR2cEsBNU3cWM:&tbnh=129&tbnw=172&ei=UvJOTf6LEofprAfb_eXa

Bg&prev=/images%3Fq%3DColosseum%26um%3D1%26hl%3Den%26biw%3D1278%26bih%

3D590%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=673&vpy=267&dur=587&hovh=180&ho

vw=267&tx=162&ty=64&oei=UvJOTf6LEofprAfb_eXaBg&esq=1&page=1&ndsp=18&ved=1t:42

9,r:9,s:0

Figure 3:

http://www.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/3/35/Trevi_Fountain_-_Left_View.jpg&imgrefurl=http://commons.wikimedia.org/wiki/File:Trevi_Fountain_-_Left_View.jpg&usg=__hSt55A8glG5gyfgND2AZ5l9ndDE=&h=1536&w=2048&sz=1074&hl=

en&start=0&sig2=lWxnDqB5ZEsi9ZfkYL1G7Q&zoom=1&tbnid=BRy9ccRv0ZqsmM:&tbnh=13

5&tbnw=178&ei=tfJOTaq9IYXRrQfw-qjaBg&prev=/images%3Fq%3Dtrevi%2Bfountain%26um%3D1%26hl%3Den%26biw%3D1278

%26bih%3D590%26tbs%3Disch:10%2C60&um=1&itbs=1&iact=rc&dur=265&oei=tfJOTaq9IY

XRrQfw-qjaBg&esq=1&page=1&ndsp=18&ved=1t:429,r:17,s:0&tx=114&ty=33&biw=1278&bih=590

Figure 4:

http://www.google.com/imgres?imgurl=http://www.bluffton.edu/~sullivanm/micheldavid/frontdet.jpg&imgrefurl=http://

www.bluffton.edu/~sullivanm/micheldavid/david.html&usg=__8p9QofzAF7TrzjemKH5KtY

y2wJs=&h=443&w=263&sz=74&hl=en&start=27&sig2=C_w2kVIR1_HjBymF5vVo_A&zoom=

1&tbnid=b-WBbzDHs69s4M:&tbnh=137&tbnw=81&ei=N_NOTbuxA8OecOC1tfsF&prev=/images%3Fq%

3Dstatue%2Bof%2Bdavid%26um%3D1%26hl%3Den%26biw%3D1278%26bih%3D590%26tbs

%3Disch:10%2C599&um=1&itbs=1&iact=rc&dur=391&oei=9vJOTdP0JMHqrAfc2vzZBg&esq=9

&page=2&ndsp=27&ved=1t:429,r:18,s:27&tx=44&ty=51&biw=1278&bih=590